Metaphor " found a scythe on a stone» it means that the Reaper will not associate with someone who has love in him. The Reaper is a metaphor for the devil and the proud. The proud are afraid of those who have love in them.
Strong desire creates impassability. A strong desire is like a great speed. Too much speed leads to the fact that the liquid becomes solid as a stone, and creates an impassability. If you slow down, you can walk through walls.